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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852e2f10c2596b30b3ac00c31d7b04cf37bb3e4745d55c6727545e4c19147392' 
  AND token = 'Ujn64t5YPwVHqvyU9vo5mqQ1G7kPypxqZarQCAriU1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}